Magnetic tape cassette

Abstract

A magnetic tape cassette having an improved tape running performance brought about by improvements in tape guides of the cassette. In accordance with the invention, the tape guides are made of a synthetic resin whose surface resistivity is adjusted to fall within the range of 10 3 to 10 9 ohm-cm. Preferably, the guides are made of a plastic resin which contains a lubricant, carbon fibers, and carbon black.

What is claimed is: 
     
       1. In a magnetic tape cassette having magnetic tape guides which are brought into contact with a magnetic tape to guide said tape running, the improvement wherein: said magnetic tape guides are made of a synthetic resin which essentially contains polyoxymethylene having an electrical surface resistivity of 10 3  to 10 9  ohms. 
     
     
       2. The magnetic tape cassette as claimed in claim 1, wherein said synthetic resin further contains a lubricant, carbon fibers, and carbon black. 
     
     
       3. The magnetic tape cassette as claimed in claim 1, wherein said synthetic resin further contains a tetrafluororesin. 
     
     
       4. The magnetic tape cassette as claimed in claim 3, wherein said tetrafluororesin is selected from the group consisting of polytetrafluoroethylene and molydbenum disulfide. 
     
     
       5. The magnetic tape cassette as claimed in claim 3, wherein said synthetic resin further contains a material selected from the group consisting of glass fibers and carbon fibers. 
     
     
       6. The magnetic tape cassette as claimed in claim 5, wherein said synthetic resin further contains carbon black.